力士乐比例减压阀DREB6X-11/175MG24-25Z4M

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力士乐比例减压阀DREB6X-11/175MG24-25Z4M
比例电磁铁的类型按照工作原理主要分为
如下几类:
(1)力控制型
这类电磁铁的行程短，只有1 5mm,输出力与输入电流成正比,常用在比例阀的先导控制级
上:
(2)行程控制型
由力控制型加负载弹簧共同组成，电磁铁输出的力通过弹簧转换成输出位移,输出位移与输入电流成正比，工作行程达3mm,线性好，可以用在直控式比例阀上;
(3)位置调节型
衔铁的位置由传感器检测后,发出一个阀内反馈信号,在阀内进行比较后重新调节衔铁的位置。阀内形成闭环控制,精度高,衔铁的位置与力
无关，精度高的比例阀如德国的博世意大利的阿托斯等都采用这种结构。
比例阀与放大器配套使用放大器采用电流负反馈,设置斜坡信号发生器阶跃函数发生器、PD调节器反向器等,控制升压降压时间或运动加速度及减速度。断电时, 能使阀芯处于安全位置。
比例电磁铁和液压阀组成电液比例阀。由于比例电磁铁可以在不同的电流下得到不同的力(或行程),因此可以无级改变压力、流量。故比例电磁铁是比例阀的关键元件。

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力士乐比例减压阀DREB6X-11/175MG24-25Z4M
力士乐REXROTH比例减压阀，先导式DRE(M)E 10, DRE(M)E 20
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力士乐REXROTH比例减压阀，先导式DRE(M) 30
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力士乐REXROTH先导式比例减压阀DRE(M)E 30
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力士乐REXROTH三通结构的比例减压阀，先导式3DRE(M)
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力士乐REXROTH三通结构的比例减压阀，先导式3DRE(M)E
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力士乐REXROTH带直流电机操作的比例减压阀，先导式DRS
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力士乐REXROTH带直流电机操作的比例减压阀，先导式ZDRS
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力士乐REXROTH比例减压阀，先导式操作，配有感应式位置传感器DREB6X
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力士乐REXROTH比例减压阀，先导式、集成电子放大版（OBE）和位置反馈DREBE6X
DREBE6X-1X/175MG24K31A1M
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力士乐REXROTH比例减压阀，先导式、集成电子（OBE）和位置反馈DREBE10Z
DREBE10Z-1X/180XYMG24K31A1M
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DREBE10Z-1X/315XYMG24K31A1M
DREBE10Z-1X/315XYMG24K31A1M-14
压力继电器用途性能
压力继电器是一种将油液的压力信号转换成电信号的液一电转换元件。当油液压力达到压力继电器的调定压力时，能自动接通或断开电路，使电磁铁、继电器、电动机等电气元件通电运转或断电停止工作，以实现对液压系统工作程序的控制、安全保护或元件动作的联锁等。任何压力继电器都是由压力一位移转换装置和微动开关两部分组成的，按压力一位移转换装置的结构划分，有柱塞式、弹簧管式、膜片式和波纹管式四类

压力继电器是利用液体的压力来启闭电气触点的液压电气转换元件。当系统压力达到压力继电器的调定值时，发出电信号，使电气元件（如电磁铁、电机、时间继电器、电磁离合器等）动作，使油路卸压、换向，执行元件实现顺序动作，或关闭电动机使系统停止工作，起安全保护作用等。

压力继电器有柱塞式、膜片式、弹簧管式和波纹管式四种结构形式。下面对柱塞式压力继电器的工作原理作一介绍：
当从继电器下端进油口3进入的液体压力达到调定压力值时，推动柱塞2上移，此位移通过杠杆放大后推动微动开关4动作。改变弹簧1的压缩量，可以调节继电器的动作压力。
应用场合：用于安全保护、控制执行元件的顺序动作、用于泵的启闭、用于泵的卸荷。
注意： 压力继电器放在压力有明显变化的地方才能输出电信号。若将压力继电器放在回油路上，由于回油路直接接回油箱，压力也没有变化，所以压力继电器也不会工作。
选用标准
根据所测对象的压力来选用,比如所测压力范围在8KG以内,那么就要选用额定10KG的压力继电器,还有要符合电路中的额定电压,接口管径的大小
3使用方法
用于安全保护时，将压力继电器设置在夹紧液压缸的一端，液压泵启动后，将工件夹紧，此时夹紧液压缸的右腔压力升高，当升高到压力继电器的调定值时，压力继电器动作，发出电信号使2YA通电，于是切削液压缸进刀切削。在加工期间，压力继电器微动开关的常开触点始终闭合。若工件没有夹紧，压力继电器2断开，于是2YA断电，切削液压缸立即停止进刀，从而避免工件未夹紧被切削而出事故。
其实用于控制执行元件的顺序动作时，液压泵启动后，2YA通电，液压缸左腔进油，推动活塞方向右移。当碰到限位器(或死挡铁)后，系统压力升高，压力继电器发出电信号，使1YA通电，高压油进入液压缸的左腔，推动活塞右移。这时若3YA也通电，液压缸的活塞快速右移;若3YA断电，则液压缸的活塞慢速右移，其慢速运动速度由节流阀调节。
再次用于液压泵卸荷时，压力继电器不是控制液压泵停止转动，而是控制二位二通电磁阀，将液压泵5输出的压力油流回油箱，使其卸荷。
后用于液压泵的启闭时，有两个液压泵，高压小流量泵，低压大流量泵。当活塞快速下降时，两泵同时输出压力油。当液压缸活塞杆抵住工件开始加压时，压力继电器在压力油作用下发出动作，触动微动开关，将常闭触点断开，使液压泵停转。在加工过程中减慢液压缸的速度，同时减少动力消耗。